Delete row sig_1ff63aa1b374 from signals

id sig_1ff63aa1b374
event_id evt_aa0552457192
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T04:23:21.223166+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f0de100c3083b87d
throttle_s 0
created_at 2026-04-12T04:23:21.223166+00:00
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